text: A large number of biologically important modified monosaccharides exist:
  * Amino sugars such as:
  ** galactosamine
  ** glucosamine
  ** sialic acid
  ** N-acetylglucosamine
  * Sulfosugars such as:
  ** sulfoquinovose
  * Others such as:
  ** ascorbic acid
  ** mannitol
  ** glucuronic acid